2 months for sure, which means almost 35 euros a day. That would be a good budget when adding the occasional flight, entrance fees and everything you will basically need, even more midrange places to stay. So I guess, when you don't move around to much and stick to ground transport, 3 months will be possible as well! Unless you party very very much with loads of vodka....baby

Jenny,If you stay in fan rooms and eat where the locals and backpack crowd frequent, you should not spend more than $20/day. Say $600/month for the basics. You should have a very enjoyable time for at least 3 months with your bankroll. My best money saving tip: Let the guys buy your booze!